| Electronics > Beginners |
| which type of capacitor for pulsed discharge |
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| LaserTazerPhaser:
Are there any electrolytics 360v-500v 540uf-1000uf which can fully charge & discharge @ ~0.714Hz? Seems film will outlast electrolytic but by far are more expensive for the charge they store than electrolytics. Maybe a gang of electrolytics can do this. |
| tautech:
Pulse grade caps are used in electric fence units however their values are only 20-40 uF IME. Most are 900 VDC rated and non polarized and always seem to be spade terminals. It's not unusual to see gangs of up to 6 paralleled for a couple of 100's uF. BTW, they are always marked as Pulse Grade. The run for many years @ 1 Hz charge/discharge rate. Try Tedds as they have some big grunty stuff for not too bad pricing. https://www.tedss.com/Capacitors |
| LaserTazerPhaser:
--- Quote from: tautech on April 03, 2019, 07:32:26 am ---Pulse grade caps are used in electric fence units however their values are only 20-40 uF IME. Most are 900 VDC rated and non polarized and always seem to be spade terminals. It's not unusual to see gangs of up to 6 paralleled for a couple of 100's uF. BTW, they are always marked as Pulse Grade. The run for many years @ 1 Hz charge/discharge rate. Try Tedds as they have some big grunty stuff for not too bad pricing. https://www.tedss.com/Capacitors --- End quote --- What precisely depicts a "pulse grade" capacitor from non "pulse grade" capacitors? These seem to be fine https://www.aliexpress.com/af/motor-start-capacitor.html?site=glo&g=y&d=y&origin=n&spm=2114.search0604.0.0.278f495eLHSZG8&filterCat=100006834%2C14191105%2C410405&jump=afs&groupsort=1&SearchText=motor+start+capacitor&SortType=total_tranpro_desc&isViewCP=y but they might pack undocumented features. |
| Zero999:
Define fully charge and discharge? That may seem like a silly question, but a capacitor will never fully charge/discharge, unless it's a connected to a constant current supply/load. You want low ESL and ESR for high current operation and if the duty cycle is high, then thermal design becomes a factor too. |
| LaserTazerPhaser:
--- Quote from: Zero999 on April 03, 2019, 11:09:20 am ---Define fully charge and discharge? That may seem like a silly question, but a capacitor will never fully charge/discharge, unless it's a connected to a constant current supply/load. You want low ESL and ESR for high current operation and if the duty cycle is high, then thermal design becomes a factor too. --- End quote --- Capacitor is clamped to a load with a thyristor then recharged and to be discharged again at ~0.74Hz electrolytics aren't up for this. |
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